Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 308
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 308, with English translation by Maimonides (Rambam).
שלא לתלוש סימני צרעת, שנאמר "הישמר בנגע הצרעת" (דברים כד,ח).
Not to remove the signs of tzara’at, as [Deuteronomy 24:8] states: "Be very careful concerning signs of tzara’at."